#game-table{
    border: 1px solid red;
}
.grid{
    width: 30px;
    height: 30px;
    background-size: 100% 100%;
}

/* 属性选择器 */
 [state=normal]{
     background-image: url(img/blank.png);
 }

 [state=normal]{
    background-image: url(img/blank.png);
}

 [is-bomb=yes]{
     background-image: url(img/boom_plain.png)
 }